[NFC] Convert OptimizationRemarkEmitter old emit() calls to new closure

[NFC] Convert OptimizationRemarkEmitter old emit() calls to new closure
parameterized emit() calls

Summary: This is not functional change to adopt new emit() API added in r313691.

Reviewed By: anemet

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D38285

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315476 91177308-0d34-0410-b5e6-96231b3b80d8